package com.yunhe.commons.util;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class HtmlUtils {
	private static final String regEx_script = "<script[^>]*?>[\\s\\S]*?<\\/script>"; // 定义script的正则表达式
    private static final String regEx_style = "<style[^>]*?>[\\s\\S]*?<\\/style>"; // 定义style的正则表达式
    private static final String regEx_html = "<[^>]+>"; // 定义HTML标签的正则表达式
    private static final String regEx_space = "\\s*|\t|\r|\n";//定义空格回车换行符
    
    /**
     * @param htmlStr
     * @return
     *  删除Html标签
     */
    public static String delHTMLTag(String htmlStr) {
        Pattern p_script = Pattern.compile(regEx_script, Pattern.CASE_INSENSITIVE);
        Matcher m_script = p_script.matcher(htmlStr);
        htmlStr = m_script.replaceAll(""); // 过滤script标签

        Pattern p_style = Pattern.compile(regEx_style, Pattern.CASE_INSENSITIVE);
        Matcher m_style = p_style.matcher(htmlStr);
        htmlStr = m_style.replaceAll(""); // 过滤style标签

        Pattern p_html = Pattern.compile(regEx_html, Pattern.CASE_INSENSITIVE);
        Matcher m_html = p_html.matcher(htmlStr);
        htmlStr = m_html.replaceAll(""); // 过滤html标签

        Pattern p_space = Pattern.compile(regEx_space, Pattern.CASE_INSENSITIVE);
        Matcher m_space = p_space.matcher(htmlStr);
        htmlStr = m_space.replaceAll(""); // 过滤空格回车标签
        return htmlStr.trim(); // 返回文本字符串
    }
    
    public static String getTextFromHtml(String htmlStr){
    	htmlStr = delHTMLTag(htmlStr);
    	htmlStr = htmlStr.replaceAll("&nbsp;", "");
    	htmlStr = htmlStr.substring(0, htmlStr.indexOf("。")+1);
    	return htmlStr;
    }
    
    /**
     * 过滤文本中的HTML标签，并只显示规定的长度，
     * 其余用省略号代替
     * @param htmlStr
     * @return
     */
    public static String removeArticleHtml(String htmlStr,int length) {

		if (htmlStr == null || length < 0) {
			return "";
		}
		htmlStr = htmlStr.replaceAll("<.*?>", "").replace("&nbsp;", "");
		if (htmlStr != null && htmlStr.length() > length) {

			htmlStr = htmlStr.substring(0, length) + " ... ";
		}

		return htmlStr;
	}
}
